Title:
SHORT-ARC TYPE DISCHARGE LAMP
Document Type and Number:
WIPO Patent Application WO/2014/038423
Kind Code:
A1
Abstract:
[Problem] To provide, for a short-arc type discharge lamp wherein a light rare earth oxide as an emitter substance is contained in a cathode in a luminous tube, a structure in which the light rare earth oxide as an emitter substance can be prevented from evaporating excessively from the cathode and thus resulting in early exhaustion. [Solution] A cathode (3) includes a body part (31) and a tip part (32) bonded to the tip side thereof and is characterized in that: the body part (31) comprises tungsten which contains a light rare earth oxide as an emitter substance; and the tip part (32) comprises tungsten which does not contain any emitter substance.
Inventors:
TAGAWA YUKIHARU (JP)
ARIMOTO TOMOYOSHI (JP)
SUGIHARA MASANORI (JP)
YASUDA YUKIO (JP)
KITANO HIROYOSHI (JP)
ARIMOTO TOMOYOSHI (JP)
SUGIHARA MASANORI (JP)
YASUDA YUKIO (JP)
KITANO HIROYOSHI (JP)
Application Number:
PCT/JP2013/072732
Publication Date:
March 13, 2014
Filing Date:
August 26, 2013
Export Citation:
Assignee:
USHIO ELECTRIC INC (JP)
International Classes:
H01J61/06; H01J61/073
Foreign References:
| JP2003187741A | 2003-07-04 | |||
| JPH05290802A | 1993-11-05 | |||
| JP2010192136A | 2010-09-02 | |||
| JP2011054428A | 2011-03-17 |
Attorney, Agent or Firm:
ISOHATA MASAO (JP)
Yasuo Isohata (JP)
Yasuo Isohata (JP)
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